import Immutable from 'immutable';
import React from 'react';
import { connect } from 'react-redux';
import PropTypes from 'prop-types';
import classNames from 'classnames';
import ImmutablePropTypes from 'react-immutable-proptypes';
import { createSelector } from 'reselect';
import { fetchStatus } from '../../actions/statuses';
import MissingIndicator from '../../components/missing_indicator';
import DetailedStatus from './components/detailed_status';
import ActionBar from './components/action_bar';
import Column from '../ui/components/column';
import {
  favourite,
  unfavourite,
  bookmark,
  unbookmark,
  reblog,
  unreblog,
  pin,
  unpin,
} from '../../actions/interactions';
import {
  replyCompose,
  mentionCompose,
  directCompose,
} from '../../actions/compose';
import {
  muteStatus,
  unmuteStatus,
  deleteStatus,
  hideStatus,
  revealStatus,
} from '../../actions/statuses';
import {
  unblockAccount,
  unmuteAccount,
} from '../../actions/accounts';
import {
  blockDomain,
  unblockDomain,
} from '../../actions/domain_blocks';
import { initMuteModal } from '../../actions/mutes';
import { initBlockModal } from '../../actions/blocks';
import { initReport } from '../../actions/reports';
import { makeGetStatus } from '../../selectors';
import { ScrollContainer } from 'react-router-scroll-4';
import ColumnBackButton from '../../components/column_back_button';
import ColumnHeader from '../../components/column_header';
import StatusContainer from '../../containers/status_container';
import { openModal } from '../../actions/modal';
import { defineMessages, injectIntl, FormattedMessage } from 'react-intl';
import ImmutablePureComponent from 'react-immutable-pure-component';
import { HotKeys } from 'react-hotkeys';
import { boostModal, deleteModal } from '../../initial_state';
import { attachFullscreenListener, detachFullscreenListener, isFullscreen } from '../ui/util/fullscreen';
import { textForScreenReader, defaultMediaVisibility } from '../../components/status';
import Icon from 'mastodon/components/icon';

const messages = defineMessages({
  deleteConfirm: { id: 'confirmations.delete.confirm', defaultMessage: 'Delete' },
  deleteMessage: { id: 'confirmations.delete.message', defaultMessage: 'Are you sure you want to delete this status?' },
  redraftConfirm: { id: 'confirmations.redraft.confirm', defaultMessage: 'Delete & redraft' },
  redraftMessage: { id: 'confirmations.redraft.message', defaultMessage: 'Are you sure you want to delete this status and re-draft it? Favourites and boosts will be lost, and replies to the original post will be orphaned.' },
  revealAll: { id: 'status.show_more_all', defaultMessage: 'Show more for all' },
  hideAll: { id: 'status.show_less_all', defaultMessage: 'Show less for all' },
  detailedStatus: { id: 'status.detailed_status', defaultMessage: 'Detailed conversation view' },
  replyConfirm: { id: 'confirmations.reply.confirm', defaultMessage: 'Reply' },
  replyMessage: { id: 'confirmations.reply.message', defaultMessage: 'Replying now will overwrite the message you are currently composing. Are you sure you want to proceed?' },
  blockDomainConfirm: { id: 'confirmations.domain_block.confirm', defaultMessage: 'Hide entire domain' },
});

const makeMapStateToProps = () => {
  const getStatus = makeGetStatus();

  const getAncestorsIds = createSelector([
    (_, { id }) => id,
    state => state.getIn(['contexts', 'inReplyTos']),
  ], (statusId, inReplyTos) => {
    let ancestorsIds = Immutable.List();
    ancestorsIds = ancestorsIds.withMutations(mutable => {
      let id = statusId;

      while (id) {
        mutable.unshift(id);
        id = inReplyTos.get(id);
      }
    });

    return ancestorsIds;
  });

  const getDescendantsIds = createSelector([
    (_, { id }) => id,
    state => state.getIn(['contexts', 'replies']),
    state => state.get('statuses'),
  ], (statusId, contextReplies, statuses) => {
    let descendantsIds = [];
    const ids = [statusId];

    while (ids.length > 0) {
      let id        = ids.shift();
      const replies = contextReplies.get(id);

      if (statusId !== id) {
        descendantsIds.push(id);
      }

      if (replies) {
        replies.reverse().forEach(reply => {
          ids.unshift(reply);
        });
      }
    }

    let insertAt = descendantsIds.findIndex((id) => statuses.get(id).get('in_reply_to_account_id') !== statuses.get(id).get('account'));
    if (insertAt !== -1) {
      descendantsIds.forEach((id, idx) => {
        if (idx > insertAt && statuses.get(id).get('in_reply_to_account_id') === statuses.get(id).get('account')) {
          descendantsIds.splice(idx, 1);
          descendantsIds.splice(insertAt, 0, id);
          insertAt += 1;
        }
      });
    }

    return Immutable.List(descendantsIds);
  });

  const mapStateToProps = (state, props) => {
    const status = getStatus(state, { id: props.params.statusId });
    let ancestorsIds = Immutable.List();
    let descendantsIds = Immutable.List();

    if (status) {
      ancestorsIds = getAncestorsIds(state, { id: status.get('in_reply_to_id') });
      descendantsIds = getDescendantsIds(state, { id: status.get('id') });
    }

    return {
      status,
      ancestorsIds,
      descendantsIds,
      askReplyConfirmation: state.getIn(['compose', 'text']).trim().length !== 0,
      domain: state.getIn(['meta', 'domain']),
    };
  };

  return mapStateToProps;
};

export default @injectIntl
@connect(makeMapStateToProps)
class Status extends ImmutablePureComponent {

  static contextTypes = {
    router: PropTypes.object,
  };

  static propTypes = {
    params: PropTypes.object.isRequired,
    dispatch: PropTypes.func.isRequired,
    status: ImmutablePropTypes.map,
    ancestorsIds: ImmutablePropTypes.list,
    descendantsIds: ImmutablePropTypes.list,
    intl: PropTypes.object.isRequired,
    askReplyConfirmation: PropTypes.bool,
    multiColumn: PropTypes.bool,
    domain: PropTypes.string.isRequired,
  };

  state = {
    fullscreen: false,
    showMedia: defaultMediaVisibility(this.props.status),
    loadedStatusId: undefined,
  };

  componentWillMount () {
    this.props.dispatch(fetchStatus(this.props.params.statusId));
  }

  componentDidMount () {
    attachFullscreenListener(this.onFullScreenChange);
  }

  componentWillReceiveProps (nextProps) {
    if (nextProps.params.statusId !== this.props.params.statusId && nextProps.params.statusId) {
      this._scrolledIntoView = false;
      this.props.dispatch(fetchStatus(nextProps.params.statusId));
    }

    if (nextProps.status && nextProps.status.get('id') !== this.state.loadedStatusId) {
      this.setState({ showMedia: defaultMediaVisibility(nextProps.status), loadedStatusId: nextProps.status.get('id') });
    }
  }

  handleToggleMediaVisibility = () => {
    this.setState({ showMedia: !this.state.showMedia });
  }

  handleFavouriteClick = (status) => {
    if (status.get('favourited')) {
      this.props.dispatch(unfavourite(status));
    } else {
      this.props.dispatch(favourite(status));
    }
  }

  handlePin = (status) => {
    if (status.get('pinned')) {
      this.props.dispatch(unpin(status));
    } else {
      this.props.dispatch(pin(status));
    }
  }

  handleReplyClick = (status) => {
    let { askReplyConfirmation, dispatch, intl } = this.props;
    if (askReplyConfirmation) {
      dispatch(openModal('CONFIRM', {
        message: intl.formatMessage(messages.replyMessage),
        confirm: intl.formatMessage(messages.replyConfirm),
        onConfirm: () => dispatch(replyCompose(status, this.context.router.history)),
      }));
    } else {
      dispatch(replyCompose(status, this.context.router.history));
    }
  }

  handleModalReblog = (status) => {
    this.props.dispatch(reblog(status));
  }

  handleReblogClick = (status, e) => {
    if (status.get('reblogged')) {
      this.props.dispatch(unreblog(status));
    } else {
      if ((e && e.shiftKey) || !boostModal) {
        this.handleModalReblog(status);
      } else {
        this.props.dispatch(openModal('BOOST', { status, onReblog: this.handleModalReblog }));
      }
    }
  }

  handleBookmarkClick = (status) => {
    if (status.get('bookmarked')) {
      this.props.dispatch(unbookmark(status));
    } else {
      this.props.dispatch(bookmark(status));
    }
  }

  handleDeleteClick = (status, history, withRedraft = false) => {
    const { dispatch, intl } = this.props;

    if (!deleteModal) {
      dispatch(deleteStatus(status.get('id'), history, withRedraft));
    } else {
      dispatch(openModal('CONFIRM', {
        message: intl.formatMessage(withRedraft ? messages.redraftMessage : messages.deleteMessage),
        confirm: intl.formatMessage(withRedraft ? messages.redraftConfirm : messages.deleteConfirm),
        onConfirm: () => dispatch(deleteStatus(status.get('id'), history, withRedraft)),
      }));
    }
  }

  handleDirectClick = (account, router) => {
    this.props.dispatch(directCompose(account, router));
  }

  handleMentionClick = (account, router) => {
    this.props.dispatch(mentionCompose(account, router));
  }

  handleOpenMedia = (media, index) => {
    this.props.dispatch(openModal('MEDIA', { media, index }));
  }

  handleOpenVideo = (media, options) => {
    this.props.dispatch(openModal('VIDEO', { media, options }));
  }

  handleHotkeyOpenMedia = e => {
    const status = this._properStatus();

    e.preventDefault();

    if (status.get('media_attachments').size > 0) {
      if (status.getIn(['media_attachments', 0, 'type']) === 'audio') {
        // TODO: toggle play/paused?
      } else if (status.getIn(['media_attachments', 0, 'type']) === 'video') {
        this.handleOpenVideo(status.getIn(['media_attachments', 0]), { startTime: 0 });
      } else {
        this.handleOpenMedia(status.get('media_attachments'), 0);
      }
    }
  }

  handleMuteClick = (account) => {
    this.props.dispatch(initMuteModal(account));
  }

  handleConversationMuteClick = (status) => {
    if (status.get('muted')) {
      this.props.dispatch(unmuteStatus(status.get('id')));
    } else {
      this.props.dispatch(muteStatus(status.get('id')));
    }
  }

  handleToggleHidden = (status) => {
    if (status.get('hidden')) {
      this.props.dispatch(revealStatus(status.get('id')));
    } else {
      this.props.dispatch(hideStatus(status.get('id')));
    }
  }

  handleToggleAll = () => {
    const { status, ancestorsIds, descendantsIds } = this.props;
    const statusIds = [status.get('id')].concat(ancestorsIds.toJS(), descendantsIds.toJS());

    if (status.get('hidden')) {
      this.props.dispatch(revealStatus(statusIds));
    } else {
      this.props.dispatch(hideStatus(statusIds));
    }
  }

  handleBlockClick = (status) => {
    const { dispatch } = this.props;
    const account = status.get('account');
    dispatch(initBlockModal(account));
  }

  handleReport = (status) => {
    this.props.dispatch(initReport(status.get('account'), status));
  }

  handleEmbed = (status) => {
    this.props.dispatch(openModal('EMBED', { url: status.get('url') }));
  }

  handleUnmuteClick = account => {
    this.props.dispatch(unmuteAccount(account.get('id')));
  }

  handleUnblockClick = account => {
    this.props.dispatch(unblockAccount(account.get('id')));
  }

  handleBlockDomainClick = domain => {
    this.props.dispatch(openModal('CONFIRM', {
      message: <FormattedMessage id='confirmations.domain_block.message' defaultMessage='Are you really, really sure you want to block the entire {domain}? In most cases a few targeted blocks or mutes are sufficient and preferable. You will not see content from that domain in any public timelines or your notifications. Your followers from that domain will be removed.' values={{ domain: <strong>{domain}</strong> }} />,
      confirm: this.props.intl.formatMessage(messages.blockDomainConfirm),
      onConfirm: () => this.props.dispatch(blockDomain(domain)),
    }));
  }

  handleUnblockDomainClick = domain => {
    this.props.dispatch(unblockDomain(domain));
  }


  handleHotkeyMoveUp = () => {
    this.handleMoveUp(this.props.status.get('id'));
  }

  handleHotkeyMoveDown = () => {
    this.handleMoveDown(this.props.status.get('id'));
  }

  handleHotkeyReply = e => {
    e.preventDefault();
    this.handleReplyClick(this.props.status);
  }

  handleHotkeyFavourite = () => {
    this.handleFavouriteClick(this.props.status);
  }

  handleHotkeyBoost = () => {
    this.handleReblogClick(this.props.status);
  }

  handleHotkeyMention = e => {
    e.preventDefault();
    this.handleMentionClick(this.props.status.get('account'));
  }

  handleHotkeyOpenProfile = () => {
    this.context.router.history.push(`/accounts/${this.props.status.getIn(['account', 'id'])}`);
  }

  handleHotkeyToggleHidden = () => {
    this.handleToggleHidden(this.props.status);
  }

  handleHotkeyToggleSensitive = () => {
    this.handleToggleMediaVisibility();
  }

  handleMoveUp = id => {
    const { status, ancestorsIds, descendantsIds } = this.props;

    if (id === status.get('id')) {
      this._selectChild(ancestorsIds.size - 1, true);
    } else {
      let index = ancestorsIds.indexOf(id);

      if (index === -1) {
        index = descendantsIds.indexOf(id);
        this._selectChild(ancestorsIds.size + index, true);
      } else {
        this._selectChild(index - 1, true);
      }
    }
  }

  handleMoveDown = id => {
    const { status, ancestorsIds, descendantsIds } = this.props;

    if (id === status.get('id')) {
      this._selectChild(ancestorsIds.size + 1, false);
    } else {
      let index = ancestorsIds.indexOf(id);

      if (index === -1) {
        index = descendantsIds.indexOf(id);
        this._selectChild(ancestorsIds.size + index + 2, false);
      } else {
        this._selectChild(index + 1, false);
      }
    }
  }

  _selectChild (index, align_top) {
    const container = this.node;
    const element = container.querySelectorAll('.focusable')[index];

    if (element) {
      if (align_top && container.scrollTop > element.offsetTop) {
        element.scrollIntoView(true);
      } else if (!align_top && container.scrollTop + container.clientHeight < element.offsetTop + element.offsetHeight) {
        element.scrollIntoView(false);
      }
      element.focus();
    }
  }

  renderChildren (list) {
    return list.map(id => (
      <StatusContainer
        key={id}
        id={id}
        onMoveUp={this.handleMoveUp}
        onMoveDown={this.handleMoveDown}
        contextType='thread'
      />
    ));
  }

  setRef = c => {
    this.node = c;
  }

  componentDidUpdate () {
    if (this._scrolledIntoView) {
      return;
    }

    const { status, ancestorsIds } = this.props;

    if (status && ancestorsIds && ancestorsIds.size > 0) {
      const element = this.node.querySelectorAll('.focusable')[ancestorsIds.size - 1];

      window.requestAnimationFrame(() => {
        element.scrollIntoView(true);
      });
      this._scrolledIntoView = true;
    }
  }

  componentWillUnmount () {
    detachFullscreenListener(this.onFullScreenChange);
  }

  onFullScreenChange = () => {
    this.setState({ fullscreen: isFullscreen() });
  }

  render () {
    let ancestors, descendants;
    const { shouldUpdateScroll, status, ancestorsIds, descendantsIds, intl, domain, multiColumn } = this.props;
    const { fullscreen } = this.state;

    if (status === null) {
      return (
        <Column>
          <ColumnBackButton multiColumn={multiColumn} />
          <MissingIndicator />
        </Column>
      );
    }

    if (ancestorsIds && ancestorsIds.size > 0) {
      ancestors = <div>{this.renderChildren(ancestorsIds)}</div>;
    }

    if (descendantsIds && descendantsIds.size > 0) {
      descendants = <div>{this.renderChildren(descendantsIds)}</div>;
    }

    const handlers = {
      moveUp: this.handleHotkeyMoveUp,
      moveDown: this.handleHotkeyMoveDown,
      reply: this.handleHotkeyReply,
      favourite: this.handleHotkeyFavourite,
      boost: this.handleHotkeyBoost,
      mention: this.handleHotkeyMention,
      openProfile: this.handleHotkeyOpenProfile,
      toggleHidden: this.handleHotkeyToggleHidden,
      toggleSensitive: this.handleHotkeyToggleSensitive,
      openMedia: this.handleHotkeyOpenMedia,
    };

    return (
      <Column bindToDocument={!multiColumn} label={intl.formatMessage(messages.detailedStatus)}>
        <ColumnHeader
          showBackButton
          multiColumn={multiColumn}
          extraButton={(
            <button className='column-header__button' title={intl.formatMessage(status.get('hidden') ? messages.revealAll : messages.hideAll)} aria-label={intl.formatMessage(status.get('hidden') ? messages.revealAll : messages.hideAll)} onClick={this.handleToggleAll} aria-pressed={status.get('hidden') ? 'false' : 'true'}><Icon id={status.get('hidden') ? 'eye-slash' : 'eye'} /></button>
          )}
        />

        <ScrollContainer scrollKey='thread' shouldUpdateScroll={shouldUpdateScroll}>
          <div className={classNames('scrollable', { fullscreen })} ref={this.setRef}>
            {ancestors}

            <HotKeys handlers={handlers}>
              <div className={classNames('focusable', 'detailed-status__wrapper')} tabIndex='0' aria-label={textForScreenReader(intl, status, false)}>
                <DetailedStatus
                  key={`details-${status.get('id')}`}
                  status={status}
                  onOpenVideo={this.handleOpenVideo}
                  onOpenMedia={this.handleOpenMedia}
                  onToggleHidden={this.handleToggleHidden}
                  domain={domain}
                  showMedia={this.state.showMedia}
                  onToggleMediaVisibility={this.handleToggleMediaVisibility}
                />

                <ActionBar
                  key={`action-bar-${status.get('id')}`}
                  status={status}
                  onReply={this.handleReplyClick}
                  onFavourite={this.handleFavouriteClick}
                  onReblog={this.handleReblogClick}
                  onBookmark={this.handleBookmarkClick}
                  onDelete={this.handleDeleteClick}
                  onDirect={this.handleDirectClick}
                  onMention={this.handleMentionClick}
                  onMute={this.handleMuteClick}
                  onUnmute={this.handleUnmuteClick}
                  onMuteConversation={this.handleConversationMuteClick}
                  onBlock={this.handleBlockClick}
                  onUnblock={this.handleUnblockClick}
                  onBlockDomain={this.handleBlockDomainClick}
                  onUnblockDomain={this.handleUnblockDomainClick}
                  onReport={this.handleReport}
                  onPin={this.handlePin}
                  onEmbed={this.handleEmbed}
                />
              </div>
            </HotKeys>

            {descendants}
          </div>
        </ScrollContainer>
      </Column>
    );
  }

}
